 cadena1="un texto"
 cadena2="otro texto"
 if test "$cadena1" = "$cadena2"
 then 
  echo "cadenas iguales"
 else 
  echo "cadenas distintas"
 fi
 if [ "$cadena1" == "$cadena1" ]
 then 
  echo "cadenas iguales"
 else 
  echo "cadenas distintas"
 fi
